This is a question I hear fairly often. There is no one right answer for everyone but I’ll tell you what you need to know in order to make the right decision for YOU.
It doesn’t really make a big difference which one you choose to start. If you start with an electric guitar then it will probably be a little easier to play notes and chords. The strings are usually thinner and they tend to be a little closer to the neck. With entry level acoustics the strings are often further away from the neck which makes them more difficult to play.
Playing an acoustic guitar requires a little more pressure to fret notes and causes a little more wear and tear on your fingers. This is not necessarily bad though! It will help you build up the hand strength you need and will help build good callouses on your fingertips. And when you have good callouses your fingers won’t hurt when you play.
You should also think about what kind of music you like best and what you think you’ll be playing most. If you want to play rippin’ Hendrix solos then you’ll need an electric guitar to do it any justice. On the other hand if you plan on doing singer/songwriter type songs then an acoustic will probably be a better fit.
And keep in mind that entry level acoustics are generally cheaper than entry level electrics.
If you have questions be sure to put leave them in the comment section!